package com.zhilingshenghuo.app.zhly.view.widget;

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.os.Build;
import android.renderscript.RSRuntimeException;

import androidx.annotation.NonNull;

import com.bumptech.glide.Glide;
import com.bumptech.glide.load.engine.bitmap_recycle.BitmapPool;

import java.nio.charset.Charset;
import java.security.MessageDigest;

import jp.wasabeef.glide.transformations.BitmapTransformation;
import jp.wasabeef.glide.transformations.internal.FastBlur;
import jp.wasabeef.glide.transformations.internal.RSBlur;

public class BlurTransformation extends BitmapTransformation {

    private static String STRING_CHARSET_NAME = "UTF-8";

    private static final String ID = "com.kevin.glidetest.BlurTransformation";

    private static Charset CHARSET = Charset.forName(STRING_CHARSET_NAME);

    private static final byte[] ID_BYTES = ID.getBytes(CHARSET);

    private static int MAX_RADIUS = 25;

    private static int DEFAULT_DOWN_SAMPLING = 1;

    private Context mContext;

    private BitmapPool mBitmapPool;

    private int mRadius;

    private int mSampling;

    public BlurTransformation(Context context) {

        this(context, Glide.get(context).getBitmapPool(), MAX_RADIUS, DEFAULT_DOWN_SAMPLING);

    }

    public BlurTransformation(Context context, BitmapPool pool) {

        this(context, pool, MAX_RADIUS, DEFAULT_DOWN_SAMPLING);

    }

    public BlurTransformation(Context context, BitmapPool pool, int radius) {

        this(context, pool, radius, DEFAULT_DOWN_SAMPLING);

    }

    public BlurTransformation(Context context, int radius) {

        this(context, Glide.get(context).getBitmapPool(), radius, DEFAULT_DOWN_SAMPLING);

    }

    public BlurTransformation(Context context, int radius, int sampling) {

        this(context, Glide.get(context).getBitmapPool(), radius, sampling);

    }

    public BlurTransformation(Context context, BitmapPool pool, int radius, int sampling) {

            mContext = context.getApplicationContext();

        mBitmapPool = pool;

        mRadius = radius;

        mSampling = sampling;

    }

    @Override

    public int hashCode() {

        return ID.hashCode();

    }

    @Override

    public boolean equals(Object obj) {

        return obj instanceof BlurTransformation;

    }

    @Override
    protected Bitmap transform(@NonNull Context context, @NonNull BitmapPool pool, @NonNull Bitmap toTransform, int outWidth, int outHeight) {
        Bitmap source = toTransform ;

        int width = source.getWidth();

        int height = source.getHeight();

        int scaledWidth = width / mSampling;

        int scaledHeight = height / mSampling;

        Bitmap bitmap = mBitmapPool.get(scaledWidth, scaledHeight, Bitmap.Config.ARGB_8888);

        if (bitmap == null) {

            bitmap = Bitmap.createBitmap(scaledWidth, scaledHeight, Bitmap.Config.ARGB_8888);

        }

        Canvas canvas = new Canvas(bitmap);

        canvas.scale(1 / (float) mSampling, 1 / (float) mSampling);

        Paint paint = new Paint();

        paint.setFlags(Paint.FILTER_BITMAP_FLAG);

        canvas.drawBitmap(source, 0, 0, paint);

        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR2) {

            try {

                bitmap = RSBlur.blur(mContext, bitmap, mRadius);

            } catch (RSRuntimeException e) {

                bitmap = FastBlur.blur(bitmap, mRadius, true);

            }

        } else {

            bitmap = FastBlur.blur(bitmap, mRadius, true);

        }

//return BitmapResource.obtain(bitmap, mBitmapPool);

        return bitmap;
    }

    @Override

    public void updateDiskCacheKey(MessageDigest messageDigest) {

        messageDigest.update(ID_BYTES);

    }
}
